I can't find any results for strong ground motion. I am lowering my estmate of the PGV to below 30 cm/s because of this video
Note the totally ridiculous construction (no lateral support) away from the collapse, which is untouched. Note also that they are digging the concrete like sand. There is barely a speck of cement powder in this stuff! Do you see rebars sticking out? Nope. I'm pretty sure this would go down at 10 cm/s, just like a Japan nuclear plant.
A good building should take 50 cm/s without cracks. As well, this earthquake was deep, perhaps over 20 km. Had it been the usual California 5 km we would have seen massive destruction as with Haiti. Had it been a shallow super-thrust as in Armenia, we wouldn't be seeing videos.